Bearing device for relay armatures and the like



Oct. 16, 1951 A. o. JORGENSEN BEARING DEVICE FOR RELAY ARMATURES AND THELIKE Filed Jan. 10, 1949 FIGS.

- INVENTOR. AND/8R5 OSSlAN JORGENSEN BY 12% Fa ATTORNEYS Patented Oct.16, 1951 BEARING DEVICE FOR RELAY ARMATURES AND THE LIKE.

Anders Ossian Jiirgcnsen, Traneberg, Sweden, assignor toTelefonaktiebolaget L M Ericsson, Stockholm, Sweden, a company of SwedenApplication January 10, 1949, Serial No. 70,073 In Sweden January 28,1948 The present invention relates to a bearing device for armatures onelectromagnetic relays and similar switching devices. For such a bearingdevice certain requirements must be fulfilled. It should, among otherthings, be so manufactured that the magnetic permeability is as great aspossible. Furthermore no sliding should arise when the armature ismoving. Moreover, the armature should, when operated, always occupyidentical external positions, because otherwise the magnetic circuit ischanged from time to time. Finally the bearing must be cheap tomanufacture. According to the present invention these requirements arecomplied with in a simple manner by means of a bearing device, in whichthe armature by means of one or more leaf springs is connected with aplate, which is arranged to be attached to a plane area adjacent one endof the core of the relay, the back part of the armature also restingagainst said plate.

The invention will be described more closely with reference to theannexed drawing. Figs. 1, 2 and 3 show different details of a relay withthe proposed armature bearing. Fig. 4 illustrates these detailsassembled on a relay with the armature in its operated position and Fig.5 shows in exaggeration a detail of the armature bearing after thearmature has moved into its released position.

The details in Figs. 1 and 2, which consist of an armature 2! with abearing plate 22 and a spring l8, are intended to be mounted on the backplane l2 of the core shown in Fig. 3, which in a manner known per se maybe manufactured of sheet-iron. This plane I2 is parallel to the axis ofthe winding space IS on the core. A lower plane area |5 borders plane |2at the sides and end. The spacing of the planes is such that the springl8 shown in Fig. 2 together with a rivet head for its fastening haveclearance between them. For control of the plate 22, shown in Fig. l,dowels I6, adapted for holes 2| in the plate 22, have been fixed on theplane I 2. Furthermore there is a threaded hole I! in the plane I2 and acorresponding hole 2! in the plate 22 for the assembly screw 30, Fig. 4.The spring l8, Fig. 2, is provided with two holes l9 to receive rivetstuds 23 on the under surface of the plate 22 and with holes 20 toreceive rivet studs 24 on the armature 2| shown in Fig. l. The plate 22consists of rather thin sheet iron with a lip 28 overhanging the end ofthe armature and formed in such a way that it reinforces the springagainst shocks for accidental striking of the armature which might moveit out of position.

1 Claim. (Cl. 345) In Fig. 4 the armature 2| and the plate 22 areriveted to the spring l8 by means of the studs 23, 24. This assemblingtakes place in a suitable fixture, which determines the position of thearmature 2i and the plate 22, respectively. For this purpose the holesl9 and 20, respectively, in the spring l8 are oversize permitting aminimum setting of the distance d between the armature 2| and the plate22, i. e. 0.2 to 0.3 mm. The holes I 9, 20, which are nearest eachother, should be such a distance from one another, that the springbetween them is of a sufficient length. This length should be such thatno fatigue arises when the armature is operated and released. The plate22 is held against the plane |2 by means of the screw 30.

The relay construction shown in Fig. 4 consists of a so-called fiat-typerelay, in which the armature is mainly parallel with the core of therelay. The armature 2| operates a contact group 44, by a change in theenergization of winding 45, by means of the movement of its front part29 with respect to the pole shoe l4 and by means of operating means 4|known per se.

Fig. 5 intends to illustrate how the spring I8 is bent when the armature2| changes into breakposition. As the spring I8 is lying in the spacebetween the plate 22 and the plane l5 it has room to bend in theprescribed manner. The above-mentioned lip 28 receives shocks when thearmature is exposed to accidental blows. The armature 2| may also beprovided with a protective shield extending in under the nearest edge ofthe plate 22. This shield may be fastened by means of the rivets 24simultaneously with the spring l8.

Assuming that the distance between the center of the pole plate l4 andthe bearing place of the armature 2| is I, Fig. 4, and the stroke of thefront part 29 of the armature at the center of the pole plate is a. andfurthermore the previously mentioned distance between the back edge ofthe armature and the plate 22 is d, the back edge of the armature willlift from the plane IS a distance when the armature is released. If herethe normal values of (1:03 mm. and a=0.7 mm. and 1:70 mm. are used Xwill be equal to 0.0003 mm. This shows that an extremely small clearancewill be obtained between the armature surface and the plane I2 of thecore onrelease.

I claim:

In an electromagnetic relay, in combination, a core having awinding-receiving portion and a Wider end section having a plane areasubstantially parallel to the axis of said portion, an armature :havinga section extending alongside the said portion of the core and .a flatpart adapted to rest throughout a large area on the core plane areaadjacent the said portion when the armature is attracted, said partbeing of such lateral width as to overhang the sides of said plane area,a plate of magnetic material secured to and contacting a large portionof said plane area beyond the armature part, similarly overhanging thesides of said area and having an edge substantially engaging the rearedge of the :armature part throughout most of its Width, a :normallyflat spring secured to the overhanging areas of said part and plate onthe sides thereof :facing the core and an integral hook on said plateclosel-y overhanging said armature part and withsaid substantiallyengaging edges :servsing to prevent such accidental displacement of thearmature as might damage the spring.

' ANDERS ossI-AN J6RGENSEN.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date "923,949 Croft June 8, 19091,274,874 Grabe Aug. 6, 1918 1,946,261 Zupa Feb. 6, 1934 10 1,991,210Henderson Feb. '12, 1935 11,994,671 Slawik Mar. 19, 1935 2,294,327 ZupaAug. 25, 1942 2,321,834 Marco June 15, 1943 2391,222 .Blattner Dec. 18,1945 15 2,421,642 Obzarny June 3, 1947 2,455,690 Matthias Dec. 7, 1948FOREIGN PATENTS Number Country Date 751,402 France May 26, 1932

